/* ============================================
   广州荣威新能源科技有限公司 - 企业官网样式
   ============================================ */

/* CSS Variables */
:root {
    --primary: #1a56db;
    --primary-dark: #0d3aa8;
    --primary-light: #e8edfc;
    --accent: #f59e0b;
    --accent-dark: #d97706;
    --text-dark: #1e293b;
    --text-medium: #475569;
    --text-light: #94a3b8;
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-section-alt: #f1f5f9;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

/* Reset & Base */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; font-size: 16px; }
body {
    font-family: var(--font-main);
    color: var(--text-dark);
    background: var(--bg-white);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; }
ul { list-style: none; }

/* Container */
.container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}
.navbar.scrolled {
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}
.nav-container {
    max-width: 1160px; margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between; height: 68px;
}
.nav-logo {
    display: flex; align-items: center; gap: 10px; font-size: 1.25rem; font-weight: 700;
    color: var(--text-dark); text-decoration: none;
}
.logo-icon { font-size: 1.5rem; }
.nav-menu { display: flex; gap: 6px; }
.nav-menu a {
    padding: 8px 15px; border-radius: var(--radius-sm);
    font-size: 0.9rem; font-weight: 500; color: var(--text-medium);
    transition: var(--transition);
}
.nav-menu a:hover { color: var(--primary); background: var(--primary-light); }
.nav-toggle { display: none; cursor: pointer; background: none; border: none; padding: 4px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text-dark); margin: 5px 0; transition: var(--transition); border-radius: 2px; }

@media (max-width: 900px) {
    .nav-toggle { display: block; }
    .nav-menu {
        position: absolute; top: 68px; left: 0; right: 0;
        background: white; flex-direction: column; padding: 16px;
        box-shadow: var(--shadow-lg); transform: translateY(-120%);
        opacity: 0; transition: var(--transition); pointer-events: none;
        border-bottom: 1px solid var(--border);
    }
    .nav-menu.active { transform: translateY(0); opacity: 1; pointer-events: auto; }
    .nav-menu a { padding: 13px 18px; font-size: 0.98rem; }
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative; min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, #0c1929 0%, #1a3665 40%, #1a56db 100%);
    overflow: hidden;
}
.hero::before {
    content: ''; position: absolute; inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    animation: bgMove 30s linear infinite;
}
@keyframes bgMove { from { transform: translate(0, 0); } to { transform: translate(60px, 60px); } }
.hero-overlay {
    position: absolute; inset: 0;
    background: radial-gradient(circle at 30% 50%, rgba(26,86,219,0.3) 0%, transparent 60%);
}
.hero-content {
    position: relative; z-index: 2; text-align: center;
    padding: 0 24px; max-width: 780px;
}
.hero-title {
    font-size: clamp(2.1rem, 5vw, 3.6rem); font-weight: 800;
    color: white; line-height: 1.2; margin-bottom: 18px; letter-spacing: -0.02em;
}
.hero-title .highlight {
    background: linear-gradient(135deg, #f59e0b, #fbbf24);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-subtitle {
    font-size: clamp(1.05rem, 2.3vw, 1.35rem);
    color: rgba(255,255,255,0.85); margin-bottom: 14px; letter-spacing: 0.15em; font-weight: 500;
}
.hero-desc {
    font-size: 1rem; color: rgba(255,255,255,0.62); margin-bottom: 36px; line-height: 1.8;
}
.hero-buttons { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 13px 30px; border-radius: 50px;
    font-size: 0.96rem; font-weight: 600; cursor: pointer;
    transition: var(--transition); border: 2px solid transparent;
    text-decoration: none;
}
.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    color: white; border-color: var(--accent);
    box-shadow: 0 4px 18px rgba(245,158,11,0.35);
}
.btn-primary:hover {
    transform: translateY(-2px); box-shadow: 0 8px 28px rgba(245,158,11,0.45);
    color: white;
}
.btn-outline {
    background: transparent; color: white;
    border-color: rgba(255,255,255,0.35);
}
.btn-outline:hover {
    background: rgba(255,255,255,0.1); border-color: white; color: white;
}

.scroll-indicator {
    position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
    text-align: center; color: rgba(255,255,255,0.42); font-size: 0.8rem; z-index: 2;
}
.scroll-indicator span { display: block; margin-bottom: 7px; letter-spacing: 0.1em; }
.scroll-arrow {
    width: 18px; height: 18px; margin: 0 auto;
    border-right: 2px solid rgba(255,255,255,0.38);
    border-bottom: 2px solid rgba(255,255,255,0.38);
    transform: rotate(45deg);
    animation: scrollBounce 2s infinite;
}
@keyframes scrollBounce {
    0%, 100% { transform: rotate(45deg) translate(0, 0); opacity: 1; }
    50% { transform: rotate(45deg) translate(4px, 4px); opacity: 0.5; }
}

/* ============================================
   Stats Section
   ============================================ */
.stats-section {
    padding: 52px 0; background: white;
    margin-top: -46px; position: relative; z-index: 10;
}
.stats-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
    background: white; border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl); padding: 40px 28px;
}
.stat-item { text-align: center; }
.stat-number {
    font-size: 2.8rem; font-weight: 800; color: var(--primary);
    line-height: 1; display: inline;
}
.stat-unit {
    font-size: 1.3rem; font-weight: 700; color: var(--accent);
    display: inline;
}
.stat-label {
    margin-top: 6px; font-size: 0.9rem; color: var(--text-medium); font-weight: 500;
}

@media (max-width: 768px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); padding: 28px 18px; gap: 16px; }
    .stat-number { font-size: 2.1rem; }
}

/* ============================================
   Sections Common
   ============================================ */
.section { padding: 90px 0; }
.section-header { text-align: center; margin-bottom: 54px; }
.section-tag {
    display: inline-block; font-size: 0.82rem; font-weight: 700;
    color: var(--primary); background: var(--primary-light);
    padding: 5px 16px; border-radius: 50px; margin-bottom: 14px;
    letter-spacing: 0.05em;
}
.section-title {
    font-size: clamp(1.7rem, 3.8vw, 2.4rem); font-weight: 800;
    color: var(--text-dark); margin-bottom: 10px; letter-spacing: -0.02em;
}
.section-desc { font-size: 1.05rem; color: var(--text-medium); max-width: 560px; margin: 0 auto; }

/* About Section */
.about-section { background: var(--bg-white); }
.about-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 52px;
}
.about-card {
    background: var(--bg-white); border: 1px solid var(--border);
    border-radius: var(--radius-md); padding: 32px 24px;
    transition: var(--transition);
}
.about-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: transparent; }
.about-icon { font-size: 2.4rem; margin-bottom: 14px; }
.about-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; color: var(--text-dark); }
.about-card p { color: var(--text-medium); font-size: 0.92rem; line-height: 1.78; }
.about-card strong { color: var(--primary); }

.advantages-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.advantage-item {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white; padding: 28px 24px; border-radius: var(--radius-md);
    transition: var(--transition);
}
.advantage-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.advantage-num {
    font-size: 2rem; font-weight: 800; opacity: 0.3; line-height: 1;
}
.advantage-item h4 { font-size: 1.08rem; font-weight: 700; margin: 7px 0 9px; }
.advantage-item p { font-size: 0.87rem; opacity: 0.88; line-height: 1.68; }

@media (max-width: 900px) {
    .about-grid, .advantages-grid { grid-template-columns: 1fr; }
}

/* ============================================
   Products Section (重设计)
   ============================================ */
.products-section { background: var(--bg-light); }

/* 技术能力条 - 横向紧凑展示 */
.tech-bar {
    display: flex; align-items: stretch; gap: 0;
    background: white; border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm); margin-bottom: 40px;
    overflow: hidden;
}
.tech-bar-item {
    flex: 1; text-align: center; padding: 22px 12px;
    display: flex; flex-direction: column; align-items: center; gap: 6px;
    transition: var(--transition);
}
.tech-bar-item:hover { background: var(--primary-light); }
.tech-bar-icon { font-size: 1.8rem; }
.tech-bar-name { font-size: 0.95rem; font-weight: 700; color: var(--text-dark); }
.tech-bar-detail { font-size: 0.78rem; color: var(--text-light); }
.tech-bar-divider {
    width: 1px; background: var(--border);
    align-self: stretch;
}

/* 产品卡片 V2 */
.products-grid-v2 {
    display: grid; grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 20px;
}

.prod-card {
    background: white; border: 1px solid var(--border);
    border-radius: var(--radius-md); padding: 26px 24px;
    transition: var(--transition);
}
.prod-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: transparent; }

/* 特色大卡（动力电池）*/
.prod-card-featured {
    grid-column: span 2;
    background: linear-gradient(135deg, #f0f7ff, #fff);
    border-color: var(--primary-light);
}
.prod-card-header {
    display: flex; align-items: center; gap: 14px; margin-bottom: 18px;
}
.prod-card-header-sm {
    display: flex; align-items: center; gap: 10px; margin-bottom: 10px;
}
.prod-card-icon { font-size: 2rem; flex-shrink: 0; }
.prod-card-header h3 { font-size: 1.15rem; font-weight: 700; color: var(--text-dark); }
.prod-card-header p { font-size: 0.88rem; color: var(--text-medium); margin: 0; }

.prod-card-body {
    display: grid; grid-template-columns: 1fr 1fr; gap: 20px;
}
.prod-card-desc { font-size: 0.88rem; color: var(--text-medium); margin-bottom: 12px; line-height: 1.65; }

.prod-specs h4, .prod-clients-box h4 {
    font-size: 0.82rem; font-weight: 700; color: var(--text-light);
    text-transform: uppercase; letter-spacing: 0.05em;
    margin-bottom: 10px;
}

.spec-tags {
    display: flex; flex-wrap: wrap; gap: 6px;
}
.spec-tags span {
    font-size: 0.8rem; background: var(--bg-light); color: var(--text-medium);
    padding: 4px 11px; border-radius: 50px; border: 1px solid var(--border);
    transition: var(--transition);
}
.spec-tags span:hover { background: var(--primary-light); color: var(--primary); border-color: var(--primary-light); }
.spec-tags-sm { margin-bottom: 0; }

.client-chips {
    display: flex; flex-wrap: wrap; gap: 6px;
}
.client-chips span {
    font-size: 0.78rem; background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white; padding: 4px 12px; border-radius: 50px;
}

@media (max-width: 900px) {
    .tech-bar { flex-wrap: wrap; }
    .tech-bar-item { flex: 1 1 calc(50% - 1px); min-width: calc(50% - 1px); }
    .tech-bar-divider { display: none; }
    .products-grid-v2 { grid-template-columns: 1fr; }
    .prod-card-featured { grid-column: span 1; }
    .prod-card-body { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
    .tech-bar-item { flex: 1 1 100%; }
}

/* ============================================
   Partners Section
   ============================================ */
.partners-section { background: var(--bg-white); }

.partner-logos-row {
    display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px;
    margin-bottom: 44px;
}
.partner-logo-item {
    background: var(--bg-light); border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 22px 10px;
    text-align: center; transition: var(--transition);
}
.partner-logo-item:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); }
.partner-logo-placeholder {
    font-size: 0.85rem; font-weight: 600; color: var(--text-medium);
}

.cases-showcase h3 {
    font-size: 1.15rem; font-weight: 700; margin-bottom: 16px; color: var(--text-dark);
    text-align: center;
}
.case-tags { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.case-tag {
    font-size: 0.82rem; background: var(--bg-light); color: var(--text-medium);
    padding: 7px 15px; border-radius: 50px; border: 1px solid var(--border);
    transition: var(--transition);
}
.case-tag:hover { background: var(--primary-light); color: var(--primary); border-color: var(--primary-light); }

@media (max-width: 768px) {
    .partner-logos-row { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 480px) {
    .partner-logos-row { grid-template-columns: repeat(2, 1fr); }
}

/* Group Section */
.group-section { background: var(--bg-light); }
.group-grid {
    display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-bottom: 40px;
}
.group-card {
    background: white; border-radius: var(--radius-md); padding: 28px 24px;
    transition: var(--transition); position: relative; overflow: hidden;
    border: 1px solid var(--border);
}
.group-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: transparent; }
.group-badge {
    display: inline-block; font-size: 0.76rem; font-weight: 700;
    color: white; background: var(--primary); padding: 3px 13px;
    border-radius: 50px; margin-bottom: 12px;
}
.group-card h3 { font-size: 1.08rem; font-weight: 700; margin-bottom: 7px; color: var(--text-dark); }
.group-card > p { font-size: 0.89rem; color: var(--text-medium); line-height: 1.68; }

.cycle-banner {
    text-align: center; background: linear-gradient(135deg, #ecfdf5, #d1fae5);
    border-radius: var(--radius-lg); padding: 40px 28px;
    border: 1px solid #a7f3d0;
}
.cycle-icon { font-size: 2.6rem; margin-bottom: 10px; }
.cycle-banner h3 { font-size: 1.2rem; font-weight: 700; color: #065f46; margin-bottom: 7px; }
.cycle-banner p { color: #047857; font-size: 0.92rem; }

@media (max-width: 768px) {
    .group-grid { grid-template-columns: 1fr; }
}

/* Mission Section */
.mission-section {
    background: linear-gradient(135deg, #1a3665, #1a56db);
    padding: 72px 0;
}
.mission-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.mission-card {
    background: rgba(255,255,255,0.1); backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-md); padding: 32px 24px;
    color: white; transition: var(--transition);
}
.mission-card:hover {
    background: rgba(255,255,255,0.15);
    transform: translateY(-4px);
}
.mission-icon { font-size: 2.2rem; margin-bottom: 14px; }
.mission-card h3 { font-size: 1.08rem; font-weight: 700; margin-bottom: 10px; }
.mission-card p { font-size: 0.88rem; opacity: 0.88; line-height: 1.75; }

@media (max-width: 768px) {
    .mission-grid { grid-template-columns: 1fr; }
}

/* Contact Section */
.contact-section { background: var(--bg-white); }
.contact-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: start;
}
.contact-info { display: flex; flex-direction: column; gap: 18px; }
.contact-item {
    display: flex; gap: 14px; align-items: flex-start;
    background: var(--bg-light); padding: 22px; border-radius: var(--radius-md);
    border: 1px solid var(--border);
    transition: var(--transition);
}
.contact-item:hover { border-color: var(--primary-light); box-shadow: var(--shadow-sm); }
.contact-icon { font-size: 1.6rem; flex-shrink: 0; }
.contact-item h4 { font-size: 0.96rem; font-weight: 700; margin-bottom: 3px; }
.contact-item p { font-size: 0.9rem; color: var(--text-medium); }
.contact-item a { color: var(--primary); font-weight: 600; }
.map-placeholder {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: var(--radius-lg); min-height: 320px;
    display: flex; align-items: center; justify-content: center;
}
.map-content { text-align: center; color: white; }
.map-pin { font-size: 2.6rem; display: block; margin-bottom: 10px; }
.map-content p { font-size: 1.12rem; font-weight: 600; }
.map-subtitle { font-size: 0.9rem !important; opacity: 0.7; margin-top: 4px !important; font-weight: 400 !important; }

@media (max-width: 768px) {
    .contact-grid { grid-template-columns: 1fr; }
    .map-placeholder { min-height: 220px; }
}

/* Footer */
.footer {
    background: #0c1929; color: rgba(255,255,255,0.7);
    padding: 56px 0 0;
}
.footer-grid {
    display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 36px;
    padding-bottom: 36px; border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand h3 { color: white; font-size: 1.22rem; margin-bottom: 10px; }
.footer-brand p { font-size: 0.87rem; margin-bottom: 3px; }
.footer-links h4, .footer-contact h4 { color: white; font-size: 0.96rem; margin-bottom: 14px; }
.footer-links li { margin-bottom: 7px; }
.footer-links a { color: rgba(255,255,255,0.58); font-size: 0.87rem; }
.footer-links a:hover { color: white; }
.footer-contact p { font-size: 0.87rem; margin-bottom: 5px; }
.footer-bottom {
    padding: 20px 0; text-align: center;
    font-size: 0.82rem; color: rgba(255,255,255,0.38);
}
.footer-bottom a { color: rgba(255,255,255,0.45); }
.footer-bottom a:hover { color: white; }

@media (max-width: 768px) {
    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}

/* ============================================
   Animations
   ============================================ */
.fade-up {
    opacity: 0; transform: translateY(28px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }
.delay-1 { transition-delay: 0.15s; }
.delay-2 { transition-delay: 0.3s; }
.delay-3 { transition-delay: 0.45s; }